Even though (Obama) campaigned extensively among white working class Pennsylvanians, he still couldn’t crack this constituency. He lost every white working class county in the state. He lost greater Pittsburgh area by 61 to 39 percent. He did poorly among Catholics–losing them 71 to 29 percent. A Democrat can’t win Pennsylvania in the fall without these voters. And those who didn’t vote in the primary but will vote in the general election are likely to be even less amenable to Obama.

But Obama also lost ground among the upscale white professionals that had helped him win states like Wisconsin, Maryland, and Virginia. For instance, Obama won my own Montgomery County, Maryland by 55 to 43 percent but he lost suburban Philadelphia’s very similar Montgomery County by 51 to 49 percent to Clinton. He lost upscale arty Bucks County by 62 to 38 percent.